Preheat oven to 350 degrees F.. Spray an 8"x8" baking pan with non-stick cooking spray or lightly grease with butter and set aside.

Add flour, sugar, walnuts and butter to a medium bowl. Using a pastry blender or a fork, combine butter with dry ingredients until mixture is combined. Alternatively, place ingredients in a food processor and pulse a few times until combined.

Reserve 1 cup of the mixture and press the remaining mixture on the bottom of prepared baking pan to form crust. Press until mixture is firmly in place.